Anthropic’s first Claude API update in three years removes three commonly used parameters, which may trigger errors in legacy code after upgrade.

Beating AI News: Anthropic has released a new version of its Claude API, `2026-10-21` — the first official update to the API’s version number since June 2023. Over the past three years, the Claude model has seen continuous iterations, but its API version remained unchanged. Anthropic plans to update APIs more frequently moving forward, to allow developers to adapt in advance to potential compatibility issues arising from new models. This update primarily removes three parameters: `temperature`, `top_p`, and `top_k`, which were originally used to control the randomness and generation patterns of model responses. After upgrading to the new API, if code still passes these parameters, it will throw an error directly. Some other old fields and message formats have also been adjusted. Anthropic has simultaneously updated its official SDK, with the new version defaulting to `2026-10-21`. Developers can use the `/claude-api` Skill in Claude Code to assist with code modifications. That said, the old version `2023-06-01` remains available, so existing projects do not need to migrate immediately.